/*
 *  Copyright 2014 Alexey Andreev.
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package org.teavm.eclipse.debugger;

import java.util.concurrent.atomic.AtomicReference;

public abstract class TeaVMVariablesHolder {
    private AtomicReference<TeaVMVariable[]> variables = new AtomicReference<>();

    public TeaVMVariable[] getVariables() {
        if (variables.get() == null) {
            variables.compareAndSet(null, createVariables());
        }
        return variables.get();
    }

    protected abstract TeaVMVariable[] createVariables();
}
